I can't give you any advice about places to learn or product but I can say I think you should do it! I have 3 little ones and they love to have their faces painted. Maybe 2 out of 20 face paintings are good. There are people out there with absolutely no artistic talent painting faces and getting money for it! It is so nice to get a really beautiful one though. If you have ANY talent whatsoever drawing or painting or with makeup I suggest you go for it!

I use and reccomend Snazaroo face paint. I know they have online walkthroughs and stuff, and possibly classes too, but you'd have to look on their site. They are definitely the best face paints I've found for kids, its extreamly rare to find someone who cant use them, they are EU and FDA compliant, and best of all, they dont set off mine, or my partner's very sensitive skin, which is my benchmark for safty.